Dual‐Crosslink Physical Hydrogels with High Toughness Based on Synergistic Hydrogen Bonding and Hydrophobic Interactions
作者： Xiaohua Chang , Yuhui Geng , Heqing Cao , Jian Zhou , Ye Tian
关键词: Chemistry 、 Supramolecular chemistry 、 Chemical engineering 、 Non-covalent interactions 、 Swelling 、 Alkyl 、 Crystallization 、 Self-healing hydrogels 、 Hydrophobic effect 、 Hydrogen bond
摘要: Constructing dual or multiple noncovalent crosslinks is highly effective to improve the mechanical and stimuli-responsive properties of supramolecular physical hydrogels, due synergistic effects different bonds. Herein, a series tough hydrogels are prepared by solution casting subsequently swelling films poly(ureidopyrimidone methacrylate-co-stearyl acrylate-co-acrylic acid). The hydrophobic interactions between crystallizable alkyl chains quadruple hydrogen bonds ureidopyrimidone (UPy) motifs serve as hydrogels. Synergistic render excellent properties, with tensile breaking stress up 4.6 MPa strain 680%. UPy promote crystallization also stabilize UPy-UPy bonding. resultant responsive external stimuli, such temperature, pH, ion; therefore, they show thermal-induced metal ion-induced triple shape memory behaviors.
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